I actually purchased the parts from a shop who would machine all the parts for me. So all of the specs were already met when they arrived. I know that the 5:1 ratio set were very tight on machining, This is a 4:1 (15 tooth and 60 tooth).
The only thing I need to do now is get a smaller set of allen keys to tighten the grub screws on the 60 tooth (which is tiny!). and make myself a spacer for the cover as the new drive sticks out slightly more.
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